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Exam : Microsoft 70-536CSharp
Title : TS:MS.NET Framework 2.0-Application Develop Foundation


1. You are writing a custom dictionary. The custom-dictionary class is named MyDictionary.
You need to ensure that the dictionary is type safe.
Which code segment should you use?
A. class MyDictionary : Dictionary<string, string>
B. class MyDictionary : HashTable
C. class MyDictionary : IDictionary
D. class MyDictionary { ... }
Dictionary<string, string> t =
new Dictionary<string, string>();
MyDictionary dictionary = (MyDictionary)t;
Answer: A

2. You are creating a class named Temperature. The Temperature class contains a public field named F. The public field F represents a temperature in degrees Fahrenheit.
You need to ensure that users can specify whether a string representation of a Temperature instance displays the Fahrenheit value or the equivalent Celsius value.
Which code segment should you use?
A. public class Temperature : IFormattable {
public int F;
public string ToString(string format, IFormatProvider fp) {
if ((format == "F")|| (format == null)) return F.ToString();
if (format == "C") return ((F - 32) / 1.8).ToString();
throw new FormatException("Invalid format string");
}
}
B. public class Temperature : ICustomFormatter {
public int F;
public string Format(string format, object arg,
IFormatProvider fp) {
if (format == "C") return ((F - 32) / 1.8).ToString();
if (format == "F") return arg.ToString();
throw new FormatException("Invalid format string");
}
}
C. public class Temperature {
public int F;
public string ToString(string format, IFormatProvider fp) {
if (format == "C") {
return ((F - 32) / 1.8).ToString();
} else {
return this.ToString();
}
}
}
D. public class Temperature {
public int F;
protected string format;
public override String ToString() {
if (format == "C")
return ((F - 32) / 1.8).ToString();
return F.ToString();
}
}
Answer: A

3. You are writing a method that returns an ArrayList named al.
You need to ensure that changes to the ArrayList are performed in a thread-safe manner.
Which code segment should you use?
A. ArrayList al = new ArrayList();
lock (al.SyncRoot)
{
return al;
}
B. ArrayList al = new ArrayList();
lock (al.SyncRoot.GetType())
{
return al;
}
C. ArrayList al = new ArrayList();
Monitor.Enter(al);
Monitor.Exit(al);
return al;
D. ArrayList al = new ArrayList();
ArrayList sync_al = ArrayList.Synchronized(al);
return sync_al;
Answer: D

4. You are creating a class named Age.
You need to ensure that the Age class is written such that collections of Age objects can be sorted.
Which code segment should you use?
A. public class Age {
public int Value;
public object CompareTo(object obj) {
if (obj is Age) {
Age _age = (Age) obj;
return Value.CompareTo(obj);
}
throw new ArgumentException("object not an Age");
}
}
B. public class Age {
public int Value;
public object CompareTo(int iValue) {
try {
return Value.CompareTo(iValue);
} catch {
throw new ArgumentException ("object not an Age");
}
}
}
C. public class Age : IComparable {
public int Value;
public int CompareTo(object obj) {
if (obj is Age) {
Age _age = (Age) obj;
return Value.CompareTo(_age.Value);
}
throw new ArgumentException("object not an Age");
}
}
D. public class Age : IComparable {
public int Value;
public int CompareTo(object obj) {
try {
return Value.CompareTo(((Age) obj).Value);
} catch {
return -1;
}
}
}
Answer: C

5. You write the following code.
public delegate void FaxDocs(object sender, FaxArgs args);
You need to create an event that will invoke FaxDocs.
Which code segment should you use?
A. public static event FaxDocs Fax;
B. public static event Fax FaxDocs;
C. public class FaxArgs : EventArgs {
private string coverPageInfo;
public FaxArgs(string coverInfo) {
this.coverPageInfo = coverPageInfo;
}
public string CoverPageInformation {
get {return this.coverPageInfo;}
}
}
D. public class FaxArgs : EventArgs {
private string coverPageInfo;
public string CoverPageInformation {
get {return this.coverPageInfo;}
}
}
Answer: A

6. You are working on a debug build of an application.
You need to find the line of code that caused an exception to be thrown.
Which property of the Exception class should you use to achieve this goal?
A. Data
B. Message
C. StackTrace
D. Source
Answer: C

7. You are instantiating a variable to store only strings. The variable is named messageStore.
You need to ensure that string messages are read and processed in the order in which they are received.
Which code segment should you use?
A. Stack<string> messageStore = new Stack<string>();
messageStore.Push("This is a test message...");
B. Stack messageStore = new Stack();
messageStore.Push("This is a test message...");
C. Queue messageStore = new Queue();
messageStore.Enqueue("This is a test message...");
D. Queue<string> messageStore = new Queue<string>();
messageStore.Enqueue("This is a test message...");
Answer: D

8. You are developing an application that stores data about your company's sales and technical support teams.
You need to ensure that the name and contact information for each person is available as a single collection when a user queries details about a specific team. You also need to ensure that the data collection guarantees type safety.
Which code segment should you use?
A. Hashtable team = new Hashtable();
team.Add(1, "Hance");
team.Add(2, "Jim");
team.Add(3, "Hanif");
team.Add(4, "Kerim");
team.Add(5, "Alex");
team.Add(6, "Mark");
team.Add(7, "Roger");
team.Add(8, "Tommy");
B. ArrayList team = new ArrayList();
team.Add("1, Hance");
team.Add("2, Jim");
team.Add("3, Hanif");
team.Add("4, Kerim");
team.Add("5, Alex");
team.Add("6, Mark");
team.Add("7, Roger");
team.Add("8, Tommy");
C. Dictionary<int, string> team =
new Dictionary<int, string>();
team.Add(1, "Hance");
team.Add(2, "Jim");
team.Add(3, "Hanif");
team.Add(4, "Kerim");
team.Add(5, "Alex");
team.Add(6, "Mark");
team.Add(7, "Roger");
team.Add(8, "Tommy");
D. string[] team =
new string[] {"1, Hance",
"2, Jim", "3, Hanif",
"4, Kerim", "5, Alex",
"6, Mark", "7, Roger",
"8, Tommy"};
Answer: C

9. You need to write a multicast delegate that accepts a DateTime argument.
Which code segment should you use?
A. public delegate int PowerDeviceOn(bool result,
DateTime autoPowerOff);
B. public delegate bool PowerDeviceOn(object sender,
EventArgs autoPowerOff);
C. public delegate void PowerDeviceOn(DateTime autoPowerOff);
D. public delegate bool PowerDeviceOn(DateTime autoPowerOff);
Answer: C

10. You are developing an application to assist the user in conducting electronic surveys. The survey consists of 25 true-or-false questions.
You need to perform the following tasks:
·Initialize each answer to true.
·Minimize the amount of memory used by each survey.
Which storage option should you choose?
A. BitVector32 answers = new BitVector32(1);
B. BitVector32 answers = new BitVector32(-1);
C. BitArray answers = new BitArray (1);
D. BitArray answers = new BitArray(-1);
Answer: B